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Old 05-19-2004, 05:14 PM
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Exclamation Lamda/EHA #'s Interpretation Help

Hey all, I'm a Newbie at this Lamda stuff so bear w/ me here:
These are the #'s I got today trying to figure out my warm hard start/low rpm prob on my 91 300TE and I need some help figuring out what exactly I am looking for and what needs to be done next. (fyi: I have recently replaced the EHA/O2 sensor/OVP and cleaned the ICV)

EHA:
Ign On + 4.2ma
Eng On + 3.8ma

Duty Cycle (via volt meter/arithmetic method): 70%

Fuel Mix (Volts @ #3pin): 4.5v

IVC- This one was funny. I could only get about 2ma out of it @ idle.

Now from my (limited) understanding of this stuff I am running quite a bit lean, but what should I do about it? Just bump up the mix? Do I need a new Lamda Tower? (If so how do I get the other one off, or is it adjustable? It does have a steel ball on top.) What other piece of equiptment should I test/replace?
I have read most everything I can find...but I'm still learning.
Thanks a ton for any help, I'm really stuck w/ where to take this!
-Matt-
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Old 05-20-2004, 11:43 AM
350SL4spd's Avatar
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Anybody? Do I just need to bump up the mixture? Or am I looking at a faulty part?
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1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress
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Old 05-20-2004, 02:35 PM
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According to the chart on the CD, you should be seeing 20mA KOEO.

And I believe the 70% is the baseline ratio before the system goes into closed loop. If you are getting this with a hot engine, then the CD says you have no TNA (engine speed) signal.
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'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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